DOCA0095EN

Opening, Closing, Resetting, and Testing a Circuit Breaker with a 9422 Toggle Handle

Opening and Closing with a 9422 Toggle Handle

Task

Action

Open the circuit breaker

Push the toggle handle from the I (ON) position to the O (OFF) position.

Close the circuit breaker

Push the toggle handle from the O (OFF) position to the I (ON) position

Resetting with the 9422 Toggle Handle After a Trip

When the circuit breaker trips, the handle either remains in the I (ON) position (A) or moves to a position (B) between I (ON) and O (OFF), depending on the internal layout of the enclosure, and the cable length in relation to the operating mechanism.

To reset the circuit breaker, place the handle in the O (OFF) position (C).

Position A
I (ON)

Position B

Position C
O (OFF)

Resetting the 9422 Toggle Handle After a Trip Caused by an Electrical Fault

The fact that a circuit breaker has tripped does not fix the cause of the fault detected on the downstream electrical equipment.

CAUTION
HAZARD OF CLOSING ON ELECTRICAL FAULT
Do not close the circuit breaker without first inspecting and, if necessary, repairing the downstream electrical equipment.
Failure to follow these instructions can result in injury or equipment damage.

Follow these steps to reset the circuit breaker after a trip caused by an electrical fault.

Step

Action

Position

1

Confirm that the handle is in the O (OFF) position.

O (OFF)

2

Take precautions to protect yourself (see Taking Precautions Before Responding to a Trip).

O (OFF)

3

Look for the cause of the detected fault (see Identifying the Cause of the Trip).

O (OFF)

4

Clean and test the downstream equipment and the circuit breaker (see Checking Equipment After a Trip).

O (OFF)

5

Push the toggle handle from the O (OFF) position to the I (ON) position.

The circuit breaker is closed.

I (ON)

Testing the Trip Mechanism with a 9422 Toggle Handle

CAUTION
HAZARD OF NUISANCE TRIPPING
Circuit breaker tests must only be done by qualified electrical personnel.
Failure to follow these instructions can result in injury or equipment damage.

When testing the trip mechanism, take precautions against:

  • Disrupting operations

  • Activating inappropriate alarms

  • With the circuit breaker in the O (OFF) position,

    open the door.

    Triggering unwanted actions

For example, tripping the circuit breaker with the push-to-trip button can lead to inappropriate fault indications or corrective actions (such as switching to an alternate power source).

There is no push-to-trip button on the door of a circuit breaker with a Class 9422 circuit breaker operating

mechanism. To check the circuit breaker trip mechanism, the door must first be opened.

Step

Action

Position

1

With the circuit breaker in the O (OFF) position, open the door.

O (OFF)

2

Holding down the interlock bar (A), turn the circuit breaker from the O (OFF) position to the I (ON) position.

The circuit breaker is ready for the test.

I (ON)

3

Press the push-to-trip button. The circuit breaker trips.

Trip

4

Turn the circuit breaker O (OFF).

O (OFF)

5

Close the door.

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